Thermo-mechanical alarm



(No Model.) 2 Sheets-Shet 1.

P KRUMSOHEID I THERMO MECHANICAL ALARM.

No. 496,519. Patented May 2, 1893.

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(No'ModeL) P. KRUMSOHEID. THERMO MECHANICAL ALARM.

No. 496,519. Patented May 2., 1893.

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v\/|TN ESSES gjV g UNITED STATES PATENT OFFICE.

PHILIP KRUMSOl-IEID, OF BOSTON, MASSACHUSETTS.

TH ERMO-M ECHANICAL ALARM.

' SPECIFICATION forming part of Letters Patent No. 496,519, dated May 2, 1893.

Application filed May 20, 1892.

T0 at whom it may concern.-

Be it known that I, PHILIP KRUMSCHEID, of Boston, in the county of Sufiolk and State of Massachusetts, have invented a new and useful Improvement in Thermo-Mechanical Alarms, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to an instrument for giving by purely mechanical means an alarm when the local temperature has exceeded certain limits, the object being to give a warning alarm, that is, a few blows on a bell, when the local temperature has slightly exceeded the desired maximum, and to give a continuous alarm when the temperature is becoming dangerously high. This object I attain by the mechanism shown in the accompanying drawings, in which- Figure 1 shows most of the parts of my device in front elevation. Fig. 2 being a view similar to that shown in Fig. 1, except that the stopdevices occupy different positions. Fig. 3 is a side elevation, showing the same parts as shown in Figs. 1 and 2.

In the drawings, let A represent the frame work or base to which I attach the several parts of my invention.

B, is a curved thermostat, consisting of two pieces of metal of different expansibility fastened together. One end of this curved thermostat is made fast to a block A, attached to the base A, the other end is connected by a pivot B to a lever L, said lever L being pivoted at L to a fixed bracket A By this arrangement, it will be seen that a change of temperature in causing the curved thermostat to expand or contract will change the position of the pivot B, and cause the lever L to swing back and forth. At the upper end, L of the lever L, I have a stop-pin L the use of which will be explainedhereinafter.

O, is a horizontal vswinging lever, pivoted at O to a fixed part of the frame. This lever also has a stop-pin, as indicated by 0 D, D, D is a cam slot made in the lever C, as shown. In this slot 3. pin L projecting from the lever L, works.

K, represents in a general way a clock movement operated by a spring or weight, as may be desired, and adapted to give motion to an Serial No. 433,756. (No model.)

escapement wheel F, which, when in motion acts through the palette E, pivoted at E, and gives a vibratory motion to the hammer H, causing it to sound an alarm on the bell M. The arms F F, are fixed to the shaft of the escape wheel F, and revolve with it, acting as stops when they come in contact with their respective stop pins L or C The arm F rotates in aplane outside of the planethat the arm F rotates in, so that the arm F though stopped by the pin L will pass the pin 0 without stopping, as it will pass behind it, the pinO only acting as a stop for the arm F, which rotates in its plane.

The operation of my device is as follows: Taking the position of the parts as shown in Fig. 1, if the temperature rises, then the thermostat B, acting upon the lever L, will throw it outward, that is, to the right until it occupies the position shown in Fig. 2, in which case it will be seen that the stop pin L will withdraw from under the stop arm F the escapement wheel F will revolve and sound an alarm. This alarm will continue until the arm F has made nearly a whole rotation, that is, until it comes in contact with the stop pin O will throw the lever L still farther to the right; this will cause the pin L to move in'the cam slot D D so as to throw the lever 0 down, thus withdrawing the stop pin C from the path of motion of the stop arm F, and thus the alarm will be continued indefinitely or until it is stopped by the person in charge.

I do not wish to confine myself to any particular form of thermostat, as there are a number that might be used in connection with my device.

I claim- 1. The combination of a thermostat,thc moving end of which is attached to the short arm of a lever, said lever being pivoted at L to a fixed part of the device, the long arm of the said lever having a stop-pin L at its upper end, the stop-pin being adapted to engage an arm attached to one of thewheels of an alarm train,and said lever and stop-pin as described with an arm attached to onewheel of an alarm train, whereby said train is held or released, all substantially as and for the purpose set forth.

Now a continued rise of temperature 2. The combination of a tl1ern1ostat, adapted to operate a lever, said lever having near its upper end a pin L adapted to operate in a slot made in a second lever in such a manner as to cause-the secondlever to swing, sald swinging lever having at its outer end a stop pin 0 adapted to engage with an arm F attached to one wheel of an alarm train whereby said train is held or released-and levers and stop-pin as described: with an arm to F attached to one wheel of an alarm train whereby said train is held or released, all substantially as and for the purpose set forth.

PHILIP KRUMSCHEID.

Nitnesses:

FRANK G. PARKER, MATTHEW M. BLUNT. 

